package com.dljd.javase.t10.map;

import java.util.HashMap;
import java.util.Hashtable;

public class HashTableDemo {

    public static void main(String[] args) {
        HashMap<String,Integer> hs1=new HashMap<>();
        hs1.put(null,23);

        System.out.println("----");
        Hashtable<String,Integer>  hs=new Hashtable<>();
        hs.put(null,234);

    }
}
